Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details)

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Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 01, 2021
Apr. 29, 2021
Mar. 12, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ (4,251) $ (3,832) $ (1,319)
Amortization of basis difference       138 143  
Sale price $ 1,900          
Crystal House [Member]            
Schedule of Equity Method Investments [Line Items]            
Gain on sale         35,100  
Riverpark At Harrison [Member]            
Schedule of Equity Method Investments [Line Items]            
Litigation Settlement, Expense       $ 900    
Urby At Harborside [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's Effective Ownership %       85.00%    
12 Vreeland Road [Member]            
Schedule of Equity Method Investments [Line Items]            
Sale price   $ 2,000        
Offices At Crystal Lake [Member]            
Schedule of Equity Method Investments [Line Items]            
Loss on Sale of Investments 1,900          
Sale price 1,900          
Riverwalk Retail [Member]            
Schedule of Equity Method Investments [Line Items]            
Percentage of additional interest acquired     80.00%      
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan And Lofts At 40 Park [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ (801) (1,010) (422)
Company's Effective Ownership %       25.00%    
Unconsolidated Joint Venture Multi-Family Properties [Member] | RiverTrace At Port Imperial [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ 92 111 317
Company's Effective Ownership %       22.50%    
Unconsolidated Joint Venture Multi-Family Properties [Member] | Crystal House [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures         (924) (687)
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Riverwalk C [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ (506) (368) (279)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverpark At Harrison [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ (1,153) (273) (172)
Company's Effective Ownership %       45.00%    
Unconsolidated Joint Venture Multi-Family Properties [Member] | Station House [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ (1,647) (1,650) (2,000)
Company's Effective Ownership %       50.00%    
Unconsolidated Joint Venture Multi-Family Properties [Member] | Urby At Harborside [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ (580) 1,095 1,587
Company's Effective Ownership %       85.00%    
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North Pier Land [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ (250)    
Unconsolidated Joint Venture Multi-Family Properties [Member] | Liberty Landing [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ (40) (5)  
Company's Effective Ownership %       50.00%    
Unconsolidated Joint Venture Office Buildings [Member] | Crystal House [Member]            
Schedule of Equity Method Investments [Line Items]            
Gain on sale       $ 35,100    
Unconsolidated Joint Venture Office Buildings [Member] | 12 Vreeland Road [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ 2 (2,035) (3,172)
Company's Effective Ownership %       50.00%    
Sale price   $ 2,000        
Unconsolidated Joint Venture Office Buildings [Member] | Offices At Crystal Lake [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ (113) 224 79
Company's Effective Ownership %       31.25%    
Loss on Sale of Investments       $ (1,900)    
Sale price $ 1,900          
Unconsolidated Joint Venture Other Property [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       (4,251) (3,832) (1,319)
Unconsolidated Joint Venture Other Property [Member] | Riverwalk Retail [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures         (10) (72)
Unconsolidated Joint Venture Other Property [Member] | Hyatt Regency Hotel Jersey City [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures         625 3,388
Unconsolidated Joint Venture Other Property [Member] | Other [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures       $ 745 $ 388 $ 114